Ballpoint pen



FIG. 1 is a perspective view of front, top plan and right side of a ballpoint pen showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is an enlarged end view taken at 7-7 in FIG. 3 thereof; and,

FIG. 8 is a front end view thereof with the writing tip projecting. 

The ornamental design for a ballpoint pen, as shown and described. 